Mike is on the left, and behind him and the drummer feller is another Great Unknown Beach Boy, "Stig O'Hara".
From his wiki entry:
"Mike Meros (1950 - 2007) played keyboards for the Beach Boys touring band from 1979 until July 4th 2000.
Mike hails from the Brooklyn Park neighborhood of Baltimore, Maryland. His entire family was musical and comprised a band known as the "Meros Brothers." Mike played in other bands as well, including the Bare Essentials and the New Apocalypse.
Mike earned a degree in Music from the University of Maryland in 1972.
Mike died unexpectedly on December 26, 2007. He had been performing as recently as July 2007 with Al Jardine."